Gee, guys, I wasn't saying I would remove `:0, or even that I wanted
to. The language doesn't belong to me. We only make incompatible
changes when we realize something should never have been implemented or
was wrongly implemented.
It's nice to know there are applications for `:0 . A suitable such
application would need to have inputs AND OUTPUTs defined to a common
template.
That's why I don't think it's a good choice for simply sequencing the
dissimilar operations that Michal mentioned in his first post. [ does that.
Henry Rich
On 9/30/2021 3:36 PM, Raoul Schorer wrote:
I'm not a pro developer in any way, but my job entails some data analysis.
Executing multiple verbs on the same data is something I do whenever I'm
extracting distinct feature vectors or summary stats from raw data.
Also, same thing when working on trees Hsu-style. I'd be sad to see :0 go!
Just my 2c.
Cheers,
Raoul
Le jeu. 30 sept. 2021 à 21:25, Michal Wallace <michal.wall...@gmail.com> a
écrit :
Huh. That's a strange thought to me.
I execute a bunch of verbs on the same arguments **all the time**,
especially when I'm working with input/output or mutable data:
- parser combinators
- virtual machines
- terminal i/o
Usually the argument in question is the empty string or some kind of state
object.
If I'm composing parsers to match your name, I want to write something
like:
(match@'Henry')`(match@'Rich')
not:
(match@'Rich') @ (match@'Henry')
Sure, the latter works, but it's silly, and gets progressively worse as the
size of the language grows.
Sometimes the natural way to express things is left to right.
J doesn't make you write strings or numeric arrays backwards.
Thankfully, now that I have my answer, I can just use:
run =:`:0
... and then redefine 'run' in the future if `:0 ever gets removed. :)
On Thu, Sep 30, 2021 at 3:00 PM Henry Rich <henryhr...@gmail.com> wrote:
I would vote to delete u`:0 rather than extend it. Executing a bunch of
verbs on the same arguments? Not a very useful thing I think.
Using [ to separate executions is The J Way. Very efficient. Train
yourself to get used to it.
Newlines are even better. Then you can put a comment on each line.
Henry Rich
On 9/30/2021 2:42 PM, Michal Wallace wrote:
That is unfortunate. Normally, I am perfectly comfortable with [ and
@
to do function composition, but sometimes I really wish to convey the
idea
of a sequence,
and it just doesn't feel like the same thing as function composition to
me.
(So I prefer newlines to [ or @ in these situations, but then that
wastes
vertical space...)
How would you feel about introducing, say,
`:_1 (and perhaps `:1 ) that guaranteed a left-to-right (and
right-to-left)
order, explicitly?
`:1 would just be (|.m)`:_1
`:1 would just be an alias for the current implementation,
which would not change alongside `:0 if `:0 changes in the future.
On Thu, Sep 30, 2021 at 2:32 PM Henry Rich <henryhr...@gmail.com>
wrote:
You cannot count on the order. All you know is that each cell of the
result corresponds to an AR in the gerund.
To execute short sentences the usage
sentencen [ ... [ sentence2 [ sentence1
can't be beat unless one of the sentences produces a modifier.
Henry Rich
On 9/30/2021 2:15 PM, Michal Wallace wrote:
Today I discovered that `:0 executes the gerund in series from left
to
right.
The execution order isn't specified in the docs (as far as I can
tell),
so
I wonder if it's an implementation detail subject to change, or if I
can
rely on this?
Almost all of the cases where I want '..' as a statement handler have
to do with executing small imperative niladic instructions in
sequence,
and it seems like `:0'' handles that perfectly:
NB. after loading tangentstorm/j-kvm/vt:
(bg@16b111122)`(fg@_15)`cscr`(goxy@5 5)`(puts@
('hello',CRLF))`:0''
(set the colors, clear the screen, go to position 5,5 and emit
'hello'...
in that order!)
So... Can I count on this execution order?
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